US1826867A

US1826867A - Multiple spindle machine

Info

Publication number: US1826867A
Application number: US745571A
Authority: US
Inventors: David F Domizi
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-10-24
Filing date: 1924-10-24
Publication date: 1931-10-13
Anticipated expiration: 1948-10-13

Description

Oct. 13, 1931. D, F, Dom. 1,826,867

MULTIPLE SPINDLE MACHINE Filed Oct. 24, 1924 14 Shets-Sheet '1 M co venfow Oct. 13, 1931. D. F. DOMIZI MULTIPLE SPINDLE MACHINE Filed Oct. 24, 1924 14 Sheets-Sheep 2 I 'oct. 13, 1931. D. F. D'OM/IZI 1,826,867

- MULTIPLE SPINDLEH 111101111111 Fil t 24, 1924 14 Sheets-Sheet 4 fffihf, 3

Oct. 13, 1-931. D. F. DOMlZl 1,826,367

' MULTIPLE SPINDLE MACHINE F le L 24, 1924 14 Sheets-Sheet 5 Oct. 13, 1931. V D. F. DOMIZI 1,326,867

"ULTIPLE SPINDLE MACHINE Filed Oct. 24, 1924 14'Sheets-Sheet 6 f FIE. 5; 3 M

Oct. 19 31. I D, N 2 1,826,867

" MULEIIPLE SPINDLE MACHINE Filed Oct. 24 1924 14, Sheets-Sheet 7 SIT-Z15 a 0cta 13, 1931.- D. F. DOMIZI 1,825,867 MULTIPLE SPINDLE momma Filed oat-24, 1924 14 Sheets-Sheet 9 0a. '13; 1931.- D.F. DOMIZI MULTIPLE SPINDLE IACHINE Filed Oct. 24, 1924 14 Sheets-Shet l0 Oct. 13, 1931. D. F. DOMIZI MULTIPLE SPINDLE MACHINE 14 Sheets-Sheet 11 Filed Oct. 24, 1924 Oct. 13, 1931. D. F. DOMIZI 1,826,867

MULTIPLE SPINDLE IACHINE Filed 00%. 24, 1924' 14 Sheets -Sheet 14 5 from the Work, the means Patented Oct. 13, 193i ,DAVIDJE- no uizror C EVELAN onro Montana sr'rnnnn MACHINE imam lined detoher 24, iaze s rijai no! 745,571.,

The present invention relates tea-metal working machine for cutting, drilling;'tur-n-' ing or similar operations-and inore parti'c I ularly Ward and from said center, said spindles-being adapted to receive tools which'operate simultaneously upon a piece of work secured I at the common center toward which the spindies move. Various forms of cutting toolsmay beemployed depending upon the character oi the operations to be performed upon 5 the work, the machine being particularly adapted for drilling and turning operations.

The present invention resides in the mechanism by which the spindles-aresimultaneouslv driven and simultaneously fed toward and for controlhngsaid driving "and feeding mechanisms, thetool holding chucks and the means for sin'oulta-w neously operating the chucks to secure or re lease the tools. I r r The present invention has for anlobject to provide in a machine of the character referred to. automatic controlling means associatedwith the driving elements for reversing the feed movements ofthe spindles at'the com pletion of the inward stroke and for automatically stopping the machine'uponjcompletion or the outward stroke. I

A further object is to automatically as they are fed tothe work and in addition to provide means'whereby .j, the: speed changmg device may beoperated'at-any desired point in the feed movement. I p A further object is to so control the feed mechanism that a ati veiy rapid feed where the work is engaged, a slower feed movement during the operation upon'the Work and a relatively rapid return-movement.

ated I controlling mechanism controlled by the movements of a spindle h'ead for varying therate of feed, for reversing the direction oi the linear movement and stopping the me 55 chine at the end of the-return movement, all

to a multiple spindle machine havingaseri-es of longitudinal movable rotary'spin dles radially disposed with respect to 'a--com-' mon center and movable longitudinally totowhich the invention appertains.

7 provide meansfor' varying the speed of rotation ofthe spindles I spindle may be given a rel-- movement up to the point A further object is to provide atri'p' oper-' tion such that the-machine may again be started into operation by the actuationof a smglecontroll-ing lever.v

a A further object 3 toprovide fiuid pres parts beingautomatically returned toa posi-fl i sureactuatorsfor the-various devices c0n- I trolling the operation' of the driving and feedin mechanisms, together with automat ically actuated valves for controlling the op eration of the actuators; 7 1 A further 'objectis to provide fluid presesure OPBIatGdlChHCk setting devices and a common sourceof pressure supply for said setting devices whereby-the tools may be simultaneously locked orrelease'd;

-With the aboveandf other objects in View,

the 'mvention ma'y be'said'to comprise the ma chine illustrated in the accompanying draw ingshereinafter described andparticularly i set forth in the appended claims; togethen of as will be apparent to oneskille'd in the art jReference should be'h'ad to theaccompanying-drawing's forminga part-of this specifica- (31 011 in which Fig-.1 is a top plan view'of the with such variations and modifications theremachine; Fig.2 is a side elevation of the m'achinelooking-toward the right in Fig. 1 Figs; 3; 4 and'5 are vertical sections taken on the 'line-A- -A-in Fig. 1; Fig. 3""showing the spindlehead at driving pulley beneath; said spindle and the gearing connecting said pulley to cent spindle, Fig; 4 showing the inner ends or .the spindle heads and the gearing through which the'remaining spindles are simultaneeously driven,-together with thesegmentdisk through which the feed movements are imthe left in Fig. l, the main the adj'a partedsimultaneously to the headsya'nd Fig;

-5 showing the spindle head-at the right in Fig; 1, the gearing for driving the spindle" in said headand the planetaryand reversing gears through which the feed mechanism ior" the heads is driven; Figso and 7 are vertical sections taken on the line B -B which isat right angles to the line'A-A in Fig. 1; Figs. 6 and? showing vertical sections'th'rough the twoheads disposed at right angles tothose shown in Figs. 3,4 and 5 together withthegearingfor driving the spindles ca'rried by said heads; Fig. 8 is a diagrammatic development of the gearing for driving the spindles and shifting the heads; Fig. 9 is a diagrammatic plan view of the segment disks vertical 5 shafts actuated thereby and the racks carried by the heads which are engaged by pinions fixed to the vertical shafts; Fig. 10 is a top plan view of the reversing mechanism in the gear train through which the spindle head 1 shifting mechanism is operated; Fig. 11 is a side elevation of the reversing mechanism showing the spring actuated trip device through which the clutch is shifted; Fig. 12 is a transverse section showing the trip actu- 15 ating lever in elevation; Fig. 18 is a side elevation of the machine showing the air pipe connections for the chucks and clutches; Fig.

14c is a rear elevation of the machine showing the air pipe connections; Fig. 15 is a side ele- 0 vation on an enlarged scale showing the automatic actuating means for the trip controlled reversing mechanism and the automatically controlled mechanism for actuating the valves controlling the supply of air to the. main drive and planetary clutches; F 16 is a transverse section on line 16-16 of Fig. 15; Fig. 17 is a transverse section online 1717 of Fig. 15; Fig. 18 is a detail View showing the pawl and ratchet of the 39 planetary change speed mechanism.

Referring to the accompanying drawings, the supporting frame 1 of the machine has a circular base portion 2 formed to provide a drip pan beneath substantially the entire 35; mechanism, the base portion having a reentrant portion 3 at one side thereof to provide an operators station convenient to the controlling levers and to the work support. The frame 1 at the top thereof is provided with 49; radially disposed guideways 4 upon which the spindle heads 5 are slidably mounted. As shown herein there are four radially disposed heads which are spaced 90 apart, each of the heads being provided with a radially ,5 disposed spindle 6, the spindle 6 projecting beyond the inner ends of the heads and adapted to receive suitable tools which operate simultaneously upon a piece of work secured to the centrally disposed work support 7.

These spindle heads 5 are identical in construction and the corresponding parts of each of the spindles are designated throughoutthe drawings by the same reference nu- 55; merals. The spindles 6 are mounted axially of the heads 5 and are supported therein by inner and

outer bearings

8 and 9. The spindles 6 are hollow from end to end and are provided at their inner ends with a tapered opening to receive conical clamping chucks 10 which when forced into the tapered openings in the spindle, grip the shank of a tool and securely hold the tool in place. The chucks 10 are drawn into the tapered opening and into clamping engagement with the,

tools by means of actuating rods 11 which are secured at their inner end to the chuck it) and extend to the outer ends of the spindles. Beyond the outer ends of the spindles each of the rods 11 has rigidly attached thereto a piston 12 which fits within a cylinder 13 rigidly attached to the outer end or the spindle 6, the cylinder and piston rotating with the spindle 6. p The cylinders 13 are enclosed within housings 14 fixed to the outer ends of the heads 5. Each cylinder 13 consists of an inner head secured to the spindle 6 and having a cylindrical outwardly projecting flange to the outer end of which is detachab y secured an outer cover plate 15. The plate 15 has rigidly attached thereto a plurality of inwardly extending studs 16 upon which are mounted coil springs 17 which bear at their outer ends upon the cover plates 15 and at their inner ends upon the piston 12, the springs 17 act ing to press the piston 12 toward the inner end of the cylinder and to shift the rod 11 in-' wardly in a direction to release the chucks 10. Each of the rods 11 has an axial bore 18 extending inwardly from its outer end to provide an air passageway and this passageway communicates with the space between the inner iead of the cylinder 13 and the inner face of the piston 12 through a passage 19 formed in the piston 12. Air under pressure is supplied to the passageway 18 by means of a non-rotatable pipe 20 which extends into the outer end of the passage through a bushing 21. When air under pressure is admitted to the cylinders 13 the pistons 12 are forced outwardly in the cylinders and through. the connecting rods 11 draw the chucks 10 into the tapered openings at the ends of the spindles 6 to securely clamp the tools.

Each of the spindles 6 has fixed thereto a spur gear 22 which meshes with an elongated spur gear 23 which is rotatably mounted upon a shaft 24 mounted in fixed supports 25 upon the top of the frame 1. The gear 22 moves with the spindle 6 as the same is moved longitudinally toward and from the work and during such movement slides along the elongated horizontally disposed gear 23.

F or simultaneously shifting the heads toward and from the work each of the spindle heads 5 are provided with a rack 26 formed along the lower edge thereof which is engaged by a pinion 2i" fixed to the upper end of a vertical shaft 28 as shown in Figs. 5, 7 and 8. The shafts 28 are journaled in fixed hearings in the frame 1 and have fixed to their lower ends, pinions 29 which mesh with gear segmen ts 30 attached to the periphery of a centrally mounted disk 31 which is carried by a vertical shaft 32 which is supported at the center of the machine by suitable hearings in a supporting spider 83. The shafts 28 are simultaneously operated to feed the heads toward the work and to withdraw the heads gear 23 associated with the spindle head which isease? from the work by meansof the'co'mmon actu atmgdIslrSl.

' Asbest shown-in Figs)? and 8, the entire mechanism is driven from a main driving pulley which isloosely mounted upon a shaft .and'is enclosed within ahousing 36 .se-

38 iixed to a. radially disposed shaft 39, the gear 38'm-eshingwith the elongated gear 23: ZZSSOCiLliGLl'Wlfll an adjacent spindle head 5 i so that the spindle 6 'oftlie adjacent head is continuously driven from the shaft 35. As

shown in Figs. 4Iand'8'the shaft 39 has fixed to its inner end a bevel -gear40 WlHCh meshes with bevelcdgears- 41 and 42 whichare fixed to the inner ends of aligned

shafts

43 and 44 disposed atright angles to the shaft 39/ Fixed to'the outer ends-of the shafts 43'an d 44 arespur gears 45 and'j46 which'mesh with intermediate gears 47 and 43which are in mesh with the elongated gears 23 which drive the spindles of the two} heads disposed at right angles to the head which is disposed directly 1 above the main dri'vingpulley-34. The two beveled gears 41 and ,42mesh with a fourth beveled gear 49which is l'lXedtO the nner end of a radial shaft 50 which/is aligned with the shaft 30' (see-Fi s. 4, 5and8) Adjacent its outer end theshaft '50 hasfixed thereto a spur gear 51 which meshes with the elongated is directlyopposite thespindle head over the driving pulley 34. Through the gearing above described all of thespindles 6 are.

driven from the shaft 35 at equal speeds. I

A friction clutch'is provided for connecting the driving pulley 34 to the shaft 35, the inner flange ofthe driving pulley 34 being formed to provide an inner conical face 52 I which cooperates with the shiftable clutch member 53; the clutch member53 having a conical peripheralportion 54 which fitswithin the conical face 52 of the pulley. It is desirable that when the clutch member 53 is disengaged from the driving pulley 34, that all of thespindles be stopped and locked against rotation and to thisend the hub portion ofthe clutch'member 53 is provided with 7 external teeth55 which engage with correspending teeth of a fixed retaining member 56 formed integrally with the casing and adapted to be engaged with the teeth 55 of the clutch member when'the same is shifted out of engagement with the pulley 34. The clutch member 53 isfshifted into and out of engagehollow; the shifter rod 57 being jconnected ment with the pulley 34 by means of a shifter rod 57 mounted within the shaft 35' which is to the V hub Y-of the ix clutch I member- 353 by means of a transverse 'pin or key '58=:which extends through .diametrically opposed slots 59 in the hollow. shafti35; the key- .58 serving to lockthe clutch member-53 against rotation on the'shaft 35. )The shifter-rod. '57 projects beyond the outerlend of the 'hol-' 1 low shaft 35 and has flxedthereto beyond the outer end of the shaft a piston 60 which fits withina cylinder 61 which is fixed tojthe' outer end of the shaft 35. The cylinder 61 has an inner head portion fixed to the shaft 35 and "an outwardly extending cylindrical flange inwhich the piston 60 fits,' the inner headof the cylinder 61 having a cylindrical flange 62 within and-concentric to its outer flange, the inner flange 62 extending into a circular groove 63 formed in the 1 3iston 60.-

An annular chamber is thus formed. between the inner head of the cylinder 61 and the innerface of the piston 60, a suitable annular p'acking 64 being secured to the inner faces of the piston. The cylinder 61 has a detachable cupshaped outer cover plate '65 within which is mounted a coil spring 66 which bears against the outer face of the piston 60 and serves to normally press the piston60 inwardly toward Y the inner head of the cylinder and to hold the clutch member 53 out of engagement with the pulley. f The outer end of the actuating rod 57 isbored to provide an axial air passageway 1 67 which receives a fixed airsupply pipe 68'.

which extends through suitable bushings 68a and delivers air under pressureto the passage 67, the passage 67 beingin communication with'the annu'lar chamber between the inner head'ofthe'" cylinderfil from the inner face OftllGPlSilOll 60 through a passage 69 formed in" the piston 60. lVhen 'air pressure is delivered to the cylinder 61 the piston 60 is moved outwardly and through the rods 67 shaft 35 from which the spindles 6 are simul taneously driven.

The spindle head'feed mechanism, as well I as-the spindle drive mechanism,' i driven 1 shifts the clutch member 53 into engagement with the pulley 7.34 to establish driving con-'' nection between the driving pulley and the from the main driving shaft '35 and to this end theshaft 50 has rigidly attached to as outer end ail-extension 7 O tov wliich isfixed a spur gear 71 which meshes with the large gear 72 of'a'planetary change speed, mechanism. The gear 7 2 has an outwardlyextend inghub 73'which is journaled in a boss 74 formed in the outer wall of the frame, the

hub 73 projects to the 'outer'side of'the bearing boss 74 and has fixedthereto a clutch member 75. J ournaled atitsouter'e'nd with-- in the-hub 73 and at its inner end in a'suit able fixed bearing adjacent the center of the machine is ashaft 7 6 which carries a clutclr member 77 adapted to be shifted into andout I of engagement with the clutch member 5'tof connect the shaft 76 to thegear172, orto disa 78 is g d by a plunger 79 mounted Within the shaft 76 which has an axial bore extending inwardly a short distance from its outer end, the plunger 79 being pressed outwardly by coil spring 80 interposed between 19 the inner end of the bore and the plunger 79, the spring 80 serving to normally hold clutch member 77 out of engagement with the clutch 75. The inner side of the key 7 8 is engaged by a plunger 81 which extends in- 133 wardly from a piston 82 which is mounted within a cylinder 83 fixed to the outer end of the shaft 76. The cylinder 83 has an axial aperture to receive a stationary air pipe 84: which delivers air under pressure to the interior of the cylinder between the piston 82 therein and the outer head, suitable packing being interposed between the air pipe 84 and rotating cylinder head to prevent leakage of air. \Vhen air is admitted through the pipe 84 into the cylinder 83 pressure is exerted upon the piston 82, forcing the same inwardly in opposition to the spring 80 and shifting the clutch member 77 into engagement with the clutch member and locking the large gear 72 to the shaft. The gear 72 has rigidly secured thereto between its hub and periphery a stub shaft 85 which is parallel with the shaft 76 upon which the gear 72 is mounted, and rotatably mounted upon the stub shaft 85 are integral inner and outer spur gears 86 and 87 which mesh respectively with

gears

88 and 89 mounted on the shaft 76, the gear 88 being fixed to the shaft 76 and the gear 89 being loosely mounted on the shaft. The inner gear 89 on the shaft 76 has an inwardly extending hub upon which is formed a ratchet 90 which is engaged by a pawl 91 pivoted to the frame (see Fig. 18).

\Vhen the shaft 76 is clutched to the large gear 72 the gear 72 and gear 88 which is fixed to the shaft 7 6, rotate in unison about the shaft 76 and the

gears

86 and 87 are locked against rotation upon the shaft 85. Since the gear 87 cannot rotate upon its shaft, the gear 89 which is loose upon the shaft 76 is caused to rotate with the

gears

72 and 88 and vith the shaft 76, the direction of rotation being such that the pawl 91 rides over the teeth of the ratchet 90. When the clutch element 77 is disengaged from the clutch ele ment 75 by release of the air pressure within the air cylinder 83, the shaft 76 is released from the gear 72 and the gear 86 travels around the gear 88 fixed to the shaft and rotates upon its shaft 85. The rotation which would normally be imparted to the

gears

86 and 87 tends to rotate the loose gear 89 in a direction opposite that in which it is rotated when the shaft 76 is clutched to the gear 72,

rotation of the gear 89 in the reverse direction being prevented, however, by the pawl 9-1 which engages the teeth of the ratchet 90. Therefore, the gear 89 is held against rotation and as the gear 72 rotates the gear 87 rolls on the stationary gear 89. The gear 87 is provided with a greater number of teeth than the gear 86, which is fixed thereto, so that as the gear 87 rolls about the fixed gear 89 the shaft 7 6 is driven by the gear 86 meshing with the gear 88 fixed to the shaft 76, the rotation of the shaft 76 when so driven being in the same direction but at a much lower rate of speed than when the shaft 76 is driven directly through the main gear 72. Means is thus provided for changing the rate of feed of the spindle heads 5 by disengaging the clutch element 77 from the clutch element 75 whereby the spindles may be rapidly advanced until the tools engage with the work and may then be advanced at a much lower rate of speed while the tools are in engagement with the work.

To provide for reversal of the linear movement of the spindle heads a reversing gear is associated with the shaft 76 inwardly of the planetary change speed gearing. This reversing gear includes a pair of oppositely facing

bevel gears

92 and 93 which have inwardly extending

hubs

94 and 95, the inner ends of which are provided with clutch teeth, the

gears

92 and 93 being held against longitudinal movement on the shaft 76 by collars 96 fixed to the shaft and engaging the outer sides of the gears and an inner sleeve 97 fixed to the shaft between the gears, the ends of the sleeve 97 engaging the inner ends of the hubs 9 1 and 95. Slidably keyed to the sleeve 97 is a circumferentially grooved clutch sleeve 98 provided with teeth at its opposite ends adapted to engage with the teeth carried by the hubs 9-1 and 95, so that by shifting the clutch sleeve either of the beveled gears may be clutched to the shaft 76. A circumferen tial groove in the clutch slide 98 is engaged by a fork 99 extending from a sliding shifter frame 100 which has bearings 101 slidably mounted upon a rod 102 which extends parallel to the shaft 76 and is secured to brackets 103 mounted upon the frame 1.

The guide rod 102 has a circumferentially grooved collar 104 slidably mounted thereon between the end bearings 101 of the shifter frame and interposed between the collar 104 and the bearings 101 are coiled

springs

105 and 106 which encircle the guide rod 102 and are mounted at their ends upon projections 107 extending inwardly from the bearings 101 and on projections 108 extending outwardly from opposite ends from the collar 104, a pair of latches 109 are pivoted at their outer ends upon the brackets 103 and extend inwardiy over the bearing members 101. The

latches 109 being each provided with a progecting shoulder 110, upon their under sides which engagethe outer faces of the bearlng assess? members: 101 to loekithei clutch-shifter {slide 100 either in aposition inawhichthe 631592 is clutched tothe shaft 76.01 in a position in wl ich the gean93 is clutchedtothe shaft 7 6, the latches 109 dropping by grayity. into locking prs tion when-the sl de 100 isshifted.

' to the limit of its movement in eitheridirection. The inner ends' of t-l'relatc'hmembers latch out of engagement-.with thev bearing.

109 have inclined faces lll by means of xirhich tie latchesare li-ftedfupon movement ofashifter arm 112whichhas a-fork'113 at its lower end engaging in "the peripheral tothe frame 1, and having laterally extending projections 11 6', which engage with-the cam faces 111 ofthe latches to release thesarne upon movement of;the arm 112toward a latch which is in engaging position. 7 i 1 It will be noted that when the vclutch sleeve 98 is in engagement withone of the hubs 94 or the latch 109i-whichholds the clutch sleeve engaging position, is-atthe endof-the slide 100 toward which the slide;must be shifted to release the clutchia-nd to vengage thesarne with the opposite gear, the arm112 heing alw H aernaln compressed air supply p pe 13 -1 ;a s best shown in 'Fi'gsr13 and 14' of the draw ngs.

ternately shifted in opposite"directions' by mechanism which will-be ,hereina-fter dee scribed. To alternately clutch the gears '92 and- 93 tothe shaft 76,the'carm-112 is sosh ifted" that it s always moved toward th latch'l09 which is in locking positions The m'qvement oi the, arm. 112 causes thecollarlO t to'be moved toward the bearingvmernberiml which is engaged bythelatch tliuscausingthe' spring 105 or l06to be compressedbetween theco'llar 1104 and the bearing rnember'iI101 engaged thereby. Duringithe movement rof the arm 1 12 in either direction the' proie'ction 1'16-,en-. with the cam face. 111, of;'the latch which is in engaging position and lifts the memher 101 with which it is engaged, where upon the spring 105 0r 1 06: which hasbeen.

compressed "by the. movements of. the collar snaps the shifEerfraineIOO to its opposite limit of noyementj and the" oppositelatch 109 snaps intoloclnng engagement with the 0p:

nositebearin'g member 101 to retain the slide in shifted position. Thus as the ar'n1 112 is I alternately swung lnfopposite directions the

gears

92 and 93 are alternatelyclutched to the shaft 70. The two beveled 'gears 92 and i 93 mesh with a largebeveled gear 117 which 4 is fixed t'o'a horizontal shaft 118' from which shaft 118 causes-the(lirectionjof movement the spindle feed. mechanism is operated and 1 the beveledigears92 and 93-are'alternatelyclutchedweb-e shaft 76, .thexshaft, 118" is al'- tcrnately driven in opposite direc'tions and eal of the directionptirotation fthe of spindles to-be reversed. Theishaft 118 V? at the: end thereof opposite that, uponIwh ichj' "the 2 311 7 l lbll li d i ijfixfid he zetm a A end portion of gear 120 which in turnmeshes withasecond -g6fldf'g 119'which vmeshes with an intermediate I intermeditegear 12l,which drives a gear. 122

gfixed ,toa horizontal shaft 123, theshaftl23 having fixedto its inner en'dva beyeled gear 124 which meshes with abeveled gear'125 I a fixed .to'pne of the verticalshafts 28 through I which movement is transmitted from the large di'sc31to the radially disposed spindle heads 5. r

with a worm/127 which ,is at i the lower end -vAsshown-in Figi 8 thelshaft l23vcarri es a worm gear 126 atits outer end which meshes ofia hand, Wheel shaft 128 to thenpperjend 1 of'which is attachedthe hand-wheel 129, ".l0y

Hieansof which the spindle'feed mechanism may be manually operated. The gear j 126 is loose upon the shaft123; but may besecurefdc i Y- thereto by means ofa 's'uitableclutch'not' shown which is controlled by the hand 'leyer The chuck setting-cylinders 13"at theoutei' operating cylinder '61 and the planetary 1.3080 that when desired the spindles may be shiftedmanually. l

change speed a clutch operating]; are all supplied with air under' pressure from The airpipe 131 has "a Valve 131athereinfby means of which the supply ofair to the ma- 'chineYmay beregulated or entirely 'cutfolf. v The air: is supplied to the various cylinders V v of the machine through two branch pipes and 133 communicating with th mfill ,1 1 i ply pipe 131. The branch pipe 132"beijng eontrblledby a manually operableifalye134, I

nd h ibremhipip 'l33 i g to ol dhya manually operableyalvel135i The-branch @139 pipe132 supplies air-to th'e ch u-cl; setting cylinders -13 v and conned ed to;each of "the inlet pipes 20 byvfiexible branch conduits T136,

1' chucks. 10 being caused tos'i'muh taneously grip the tools whenfa'ir is admitted v .to the cylinders '13 by opening is the controlling valve 134. The branch pipe133supplies; air .to the main drive-clutch"cylinder;

being. controlled by automatically actuated trend to the planetary clutch; cylinder 83," 5 "the; supply of air tothecy-linders 61 and 63- v v alves 137and 138 which are: best shown in 7 Figs. 153.16 and alongside the reversingand speed change pipe 133;.to a pipe to a pipe HO-disposed abovethe same WhiQh m mbeeis eng e an di tll d i 13 y 17. The pipe 133 terminat-- mg adjacent. the portion of; the frame 1 spindle feed mechanism.

work, the spindles are fed at a relatively slow rate. Upon completion of the inward stroke of the spindles the feed mechanism is automatically reversed and the planetary clutch re-engaged so that the spindles are returned at a rapid rate and, upon completion of the outward movement of the spindle heads, the main driving clutch is disengaged, stopping the entire mechanism, the parts of the controlling mechanism being in such position when the machine is stopped that the'machine may be again started and the above described operation repeated by shifting a'controlling lever in one direction. The

automatic controlling mechanism for causing the operation above described will now be explained, this mechanism being shown in detail in Figs. 15, 16 and 17.

One of the side flanges 141 of the spindle head 5 which is mounted directly above the planetary speed change mechanism and the reversing mechanism has a retaining plate 142 bolted to the under face thereof which engages with the underside of the flange of the guideway 4 and this retaining plate is the outerhead 146 engages with the trip armprovided on its underside with a longitudinally extending T-shaped slot 143 which receives the head of bolts 144 which carry abut ment blocks 145 which have trip arm engaging heads 146 adjustably secured to their in ner ends. The blocks 145 are secured to the plate 142 at points such that the distance between the heads 146 corresponds to the extent of inward and outward movement to be imparted to the spindle heads, the amount or" movement of the heads depending upon the distance between the trip arm engaging heads 146 and this distance being regulable by adjusting the heads 146 in the blocks 145 or by adjusting the blocks 145 along the plate 142. The adjustable heads 146 engage with a trip arm 147 which extends upwardly from the sleeve 114 which carries the depending trip arm 112 which operatesthe reversing clutch. The outer abutment head 146 is so set that as the spindle head approaches the position at which it is desired to stop the feed movement,

147 swinging arm 147 and with it the arm 112 in a direction to shift the reversing clutch sleeve 98 and reverse the direction of movement ofthe feed mechanism. The inner of the abutment heads 146 is so positioned as to engage with the trip arm 147 to again shift the reversing clutch sleeve 98 in the opposite direction at the point where the outward movement of the spindle heads is to be stopped.

The flange 141 of the head is provided along its outer edge with a T-shaped slot 148 which receives the head of a bolt 149 by means of r which a slide block 150 is adjustably attached to the head. The slide block 150 has a de pending trip arm 151 carried by a pivot pin 151a and having an upwardly extending lug 1515 which is engageable with an abutment member 1510 carried by the block 150 by which the movement of the lower end of the trip arm in an outward direction past vertical position is prevented, the trip arm 151 being designed to actuate a trip member during inward movement of the head and to ride over said trip member during outward movement of the head. The trip members mounted upon the spindle head in addition to actuating the reversing mechanism also cause the actuation of devices for shifting the two

valves

137 and 138 which control the operation of the main drive and planetary clutch-es.

The valve 138 is provided with a laterally extending arm 152 through which extends the "upper end portion of a lever 153 which is piv oted adjacent its lower end upon a transverse pivot bolt 154which is secured between an outer bracket plate 155 and the wall of the frame 1, the frame 1 having an outwardly project 'ing flange 156 to the outer edge of which the bracket plate 155 is secured. The lever 153 has an integral relatively short laterally extending portion 157 adjacent the pivot from which is pivotally suspended a rod 158 which extends through and is slidably mounted in a plate 159 which is suspended from the flange 156. A coil spring 161 surrounds the rod 158 and bears at its lower end upon the plate 159 and at its upper end against an abut ment 162 formed adjacent the upper end of the rod 158, the flange 156 being apertured to permit the rod 158 and spring 151 to extend therethrough. The spring 161 exerts its pressure in a direction to move the upper end of the lever153 inwardly to move the valve 138 to-a position in which communication between the supply pipe 133 and the pipe 140 leading to the cylinder 83 controlling the planetary clutch is cut oil and in which the pipe 143 is open to atmosphere, the valve 138 being a three-way valve of the usual construction. Means are provided for releasably retaining the lever153 in a position in which communication is established between the

pipes

133 and 140 to supply pressure to the planetary clutch actuating cylinder the spring 161 acting to release the pressure